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Proceedings Paper

The polishing of WEAVE spectrograph collimator mirror
Author(s): Rafael Izazaga; Esperanza Carrasco; Andrea Hidalgo; Gavin Dalton; Scott Trager; J. Alfonso L. Aguerri; Piercarlo Bonifacio; Antonella Vallenari; Don Carlos Abrams; Kevin Middleton
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Paper Abstract

WEAVE is the new wide field multi-object and integral field survey facility for the prime focus of the 4.2 m William Herschel Telescope. It is located at the Observatorio Roque de los Muchachos, in La Palma, Canary Islands, Spain. WEAVE fiber-fed spectrograph offers two resolutions, R ~ 5000 and 20,000. It has a collimator mirror and two cameras optimized for the wavelength intervals of 366 - 959 nm and 579 - 959 nm, respectively. One of the responsibilities of INAOE within the WEAVE collaboration is the polishing of the collimator mirror, made of OHARA CLEARCERAM®- Z HS. The collimator has a diameter of 660 mm, a central thickness of 44.7 mm and a weight of 56.8 kg. The main specifications are: 2 fringes irregularity in a clear aperture of 624 mm diameter and a radius of curvature of 1224.65 mm +/- 0.15. In this work, we present the polishing process and final results for the collimator. In particular, we describe the tools developed for its manufacturing, the modifications carried out to the conventional polishing machine to support the glass. Additionally, the interferometric optical irregularity measurements are presented. The collimator polishing process is finished fulfilling all the optical specifications.

Paper Details

Date Published: 10 July 2018
PDF: 17 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107060J (10 July 2018); doi: 10.1117/12.2314342
Show Author Affiliations
Rafael Izazaga, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Esperanza Carrasco, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Andrea Hidalgo, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Univ. of Oxford (United Kingdom)
Gavin Dalton, Univ. of Oxford (United Kingdom)
STFC Rutherford Appleton Lab. (United Kingdom)
Scott Trager, Kapteyn Astronomical Institute (Netherlands)
J. Alfonso L. Aguerri, Instituto de Astrofísica de Canarias (Spain)
Piercarlo Bonifacio, GEPI, Observatoire de Paris à Meudon (France)
Antonella Vallenari, INAF - Osservatorio Astronomico di Padova (Italy)
Don Carlos Abrams, Isaac Newton Group of Telescopes (Spain)
Kevin Middleton, RAL Space, STFC Rutherford Appleton Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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